Telephone system.



110 849,032. PATENTED-APR. 2, 1907 O. A. WARDNER.

TELEPHONE SYSTEM. APPLICATION FILED DEC. 7, 1905.

2 SHEETS-SHEET 1.

ID A

"UNITJTED STATES TELEPHONE SYSTEM.

Specification of Letters Patent.

'katsnted April 2, 1907.

Application filed December 7. 1906. Serial No, 290,722

To all whom, it may concern.-

Be it known that l, CHARLES A. VVARZDNER, a citizen of the United States, residing at Brushton, in the county of Franklin and 5 State of New York, have iijivented certain new and useful improvement in a Telephone System, of which the following is a specification, reference being had therein to the ac coin anying drawings.

i invention relates to telephone systems and the apparatus therefor; and the object of the invention. is the provision of means whereby the talking capacity of a line is doubled, enabling two separate conversations to he carried on at the same time Without interfering with each other. Toattain this, I make one talking-circuit entirely inetallic and the other grounded.

,A further object of the invention is the rovision of means to double the number of instruments on the line, which I attain by using a third wire operating in conjunction with the ground-circuit anda suitable switch a d which is adapted to carry hells only.

5 .1 eiotoiore systems of this type have proved noisy, and there was such a quantity 0.: crosstallr that many systems have had to he abandoned after installation.

With the present invention 1 not only do away with and obviate the difiiculties heretofore encountered, but an]. able to use a greater number of instruments and at the same time provide means whereby parties having their telephones connected to ground are'not-dis- 3 turhedby the ringing of parties connected nietallic, and vice versa.

Specifically stated, m invention coinhnnpledos a system having an independent metallic circuit, a third wire associated with said metallic circuit, and a common ground return for two of said wires, so that talking can be carried on over the metallic circuit and over the ground-circuit, and by the addition of the third wire ringingcurrent can he sent over-two oi; the Wires and over the third and the ground, which enables me-to'get just double the ringing 'fecii'ities.

. -Further objects of the invention will be ap arent when the appended specific description is read in connection with the tUGOllk pany'ing drawings, in whicl:r-

Figure 1 is aside elevation of the hook and spec-rel switches with the inclosing casing is a' plan view of the broken away, Fig. 2

letehrplatc associated with the hook and special switch-levers, andl ig 3 is a diagram.- niatic view oi the wiring of several substations on the circuit with the bells at station a grounded.

Referring to the drawings, 1 and. 2 represent the conductors of the metallic circuit, and 3 the supplemental conductor, which is used for hells only. Each substationprovided With .the usual telephone-box E, to which are secured the terminal binding-posts 7 8, and 9 for the wires l, Land 6, which are tapped oil the wires 1, 2, and 3, respectively.

ltigidly secured to the box or casing E is an arm'i l, which is provided with a depend.- ing portion 12, adapted to receive the switch coi'itzii-ct-springs s, s, s, and s, which are adapted to he actuated by a switchderer s, pivoted upon the arm 11 and having a haudle s proiccting outside of the casing. This lever s" is normally held in raised position by a spring s, secured to the depending portion 12 of the arm ii and bears against a lug on the under side of the lGVi-Bl. Springs s and. s are separated from each other and held in. this relation by suitable insulation, and spring 8 is connected to the operating-wring s by suitable insulation. liv ted to the casing it at w" is n hoolelevcr Vi having at its upper end a h no]; w, adapted to normally lie within. the path of the switch-lever s. The lower end of said lever W provided with a weight w, having e cam-face w"- adapted for ci'igegoment with the hook-lever [L of the switch ii.

It Will be seen that when. the hoolelcvor It is depressed by reason oi. the receiver it being in place the hook end 20 ol the lever W is thrown out of the path of the swiichdovcr s"; but when the switch-lever h is in raised position the hook end in is in the path-oi the lever 8", so that it may engage said lever and hold it in depressed position, thus changing the relation of S\\"li1(;ll*SPl.i11gS s, s, 8*, and s s, the relation of and s remaining always the same. Normally when ringing and tells ing over the metallic conductors l and 2 the switch S and the hook-lover W play no part; but when it is ascertained that the metallic side of the line is being used and it is necessary to use the gro'midcd circuit the receiver is removed from the hook it, and upon linding that the metallic side is being used the switch-handle s is depressed, thus allowing the hook w to engage the lever s" and hold it in depressed position, by which action the system is changed from a metallic one to a grounded one. Thus instruments connected ground on the circuit can be rung and talked I to without interruption to any metallic conversation. The metallic ririging-circuit is traced as follows from the terminal bind-- ing-post 7,: wire 13,- 2'8, 29, thence through switch-hook h, by wire 22, through ringer Q, wire 20,switcl1 springs s and 8, wire 14, terminal binding-post 8, wire 5, to conductor 2. The grounded ringing circuit when the 1 switch-lever 80 is depressed is traced as fol lows: from ground at station A, 32, 10, 1'5, 8 s, 20, 24', 2-4, 27 ,g, 30, 28,23, s s 17, 9, 3, and to the substation A over wire 6, 9, 18, 2, 3 Q, a, 3 19, 10, 32, and ground.

The talking-circuit is traced as follows: from wire 1 to 4, from terminal binding-post 7 wires 13, 28, and 29, switclnhook ]t, to wire 25 and the seconary i of the coil I, to wires 26 and 24, to binding-post 24, From thence it passes to switch-springs s and s, wire 14,

terminal bindin -post 8, and wire '5 to the nently with each side of the ringer Q and having terminal tips adapt'ed-torem-ovablyconnect withthe binding-posts 2-2 and 24 and also into the binding-posts y and 2..

'The binding-post 1/ leads directly through means tie bells of any instrument can bev wire 19 to the terminal 10 and wire 32 to:

ground, and the binding-post z is connected through wire 18, terminal 9, and wire 6 to the sup lemental conductor 3. By this changed from metallic to ,lgrounded,"and

' z are inthe binding-post 22 and 24,

subscriber can rin any subscriber can ring ,a otherinstrumentseon the line whose bells are grounded -to the third wire I) Y pressing down the lever s" while ringing. I If the flexible cords y'and all other instruments on the line whose be ls are connected metallic by ringin in the ordinary way without dev.pressin t ie lever 8.

In t 1e system shown in Fig."3 I have shown three stationsdesignated. as A station, A" station, and A station for eonvenience in referring thereto. In the eneral operation of the signaling devices of t e sys+ tern let-it be assumed that a person a't any substation, as A, vwishes to communicate with any other station -for instance, station any depressing andle 8 while ringing ground A. He first takes 131 the receiver from the sw1tch-hook S. an listens to ascertain whether or not the line is already employed by some other station. Finding the circuit free, he then operates the generator G in the ordinary manner to rin station A. This results in the ringing of al metallic bells, as follows: from contact 9' of generator G, wire 27, wire 24, binding-post 24, 20, s, s, 14, 8, 5,2, and to the subscribers bells connected metallic and over the sulfi' station-circuit, thus: 5, 8, 14, s, s, 20, 24, Q,- 22, 22, H, 29, 28, 13, 7, 4, and back over linewire 1 to the wire 4, binding-post 7, 13, 28,- 30, back to generator G; but each sub scriber has his own codesignal and as the; generator is operated in a manner to eorrej spend to station A all other stations will disregard the ringing of their'bells and conversation canbe carried on in the ordinary way. If, however, the metallic line being used and the person calling station A is in a hurry, he depresses the switch-lever s" after the receiver has been removed from the switch" hook it and releases it; but owing to the fact the switeh evcr It the hook in thereof will engage the lever e and hold it in depressed position until the receiver again hung up, when the lever 7i weighted end to of the lever and throws the hooked end w.- out of engagement with the lever s", which is now thrown to its ori inal, po'sitionjby the spring 8 With the ever 8 in depressed over the grounded circuit that interferes in no way with the talking or ringing of other telephones on the line over the "metallic circuit Ifthe metallic line is busyand the acts upon the cam wtof the 95 stations having their that the hookdever W is not acted upon by position the talking is i oc.

subscriber at A desires to call the sub-'1o5 scriber at A, he rings over the metallic eir: cuit in the regular way and by means of the code used gets the subscriber he wants. This results in all the metallic bells ringing busy. Tris can be obviated in any wellknown or suitable manner.

Instruments equipped with this invent-ion can be used anywhere and in any way that II ordinaiy bridging instruments can. W hen used as-ordinary instruments on asingle Wire or grounded system, by the addition of another wire to make the linemetallic the sys and a slight buzz in the receivers of the-m e- 11o tallic tele hones at the substations which are 1 term can be -used with all bells meno tallic, and the talking ca acity will then be doubled, (one metallic an one rounded circuit.) By connecting half the ells metallic and half grounded by means of clipsy' the system can now be used with only one (me 1.; 5'

tallic) talking-circuit, but with double or split ringing-circuit,' as half-the substations can be run metallic and half grounded)? In this last case wire 4must connect-to'bothlgo terminal binding-post 7 and terminal bindin -post 9. Thus main wire 1 takes the place of and 3.

It will be seen by the above that the invention can be used Without the third wire; but if itis desired to double both the talking capacity and the number of instruments the third wire must be used.

A telephone equipped with. this invention can be used on any common metallic bridgingline to connect any one desired subscriber. with the swit(-hboard,-so as to render abso lutely private service without interfering with the regular service of the other telephones on. the lin'e,'or any two subscribers can be equipped with this device on a common metallic bridging-line and can conduct their business privately in addition. to using the rest of the line in the ordinary way, and, furthermorc, a metallic bridging-line equipped with this invention, whether using two or three wires, can be switched onto a common grounded or single-wire bridging-line and hold conversation therewith without the use of a repeating-coil.

Having thus described my invention, what I claim, anddesire to'secure'by Letters Pat cut, is

1. A party-line telephone system, comprising a main circuit having two metallic conductors, a supplennintal conductor, a common ground return for one or more of said conductors; and means whereby one of said conductors and the common ground re turn may be utilized for talking purposes while the main circuit is being used.

' 2. A party-line telephone system, comprising a main circuit having two metallic conductors, a supplemental conductor, a common ground return. for one or more of said conductors, means for sending ringingcurrent over the main circuit, and means whereby ringing-current may he sent over the supplemental conductor and said ground 3. A party-line telephone. system, comprising a main circuit having two metallic.

or more of saidi conciluctors, and -means whereby the normal talking-circuit can be changed from metallic to grounded.

5. In a party-line telephone system, the I combination with a main circuit having two metallic conductors, of a supplemental conductor, a common ground return for one or more of said conductors, means for changing the normal talking-circuit from metallic to grounded, and means for holding said last- .named means in operative position during conductor, a common ground return for one or moreof said conductors, a' switch for changing thejn'ormal talking-circuit from a metallic to a grounded one, means for holding said switch in operative position, and means for automatically releasing said switch,

8. In a party-line telephone system, the

combination with a main circuitcomprising two metallic conductors, of a supplemental conductor, a common ground return for one or more of said conductors, a switch forchanging the normal talking-circuit from a metallic to a grounded one, a weighted hooklever adapted to engage said switch to hold it in operative position, and a receiver-lever adapted to release said weighted lever so that the switch may be returned to its normal position.

9. A party-line telephone ystem, comprising a main circuit having two metallic conductors, a supplemental conductor, substations connected to said conductors, ringers at the substations, and means for chang ing the ringers from the metallic circuit to one of the conductors and a common ground return.

In testimony whereof I have allixed my signature in presence of two witnesses.

cumulus A. WARDNER. 

